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Service Guide ML590/ML591
Chapter 2 Principles of Operation
Space Motor Control
The SP/LF motor driver (Location 5A: MHM2025) drives the three-phase brushless motor. Motor
movement is based on the phase signal (SPU,SPV and SPW) and the speed instruction data
from the LSI. The MPU can identify the current speed of the space motor by measuring the pulse
width of the output (Phase A, Phase B) of the encoder disk sensor.
After comparing the target speed for each print mode with the actual speed, the motor is
accelerated or decelerated to maintain the desired speed for each print mode.
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